FM bug transmitters are simple electronic projects that can transmit conversations to any FM radio. The range is usually small at around 100 feet, but the project is simple enough for a beginner. What you need to start off with is a plastic mint box (definitely not tin) and some basic PCB skills. The FM bug transmitter parts list includes the basics such as including a variety of transistors, capacitors, resistors, a button battery, and a microphone.
The circuit fits in a tiny mint box which is smaller than a typical USB drive. The FM bug transmitter is a fun project and also teaches a lot about basic electronics and radio frequency modulation. Note: it’s illegal in most countries to record people without their permission. Check out more of our DIY spy projects: